Are you influenced by your neighbors? The same is true of the nanoparticles in the catalyst. New research by Chalmers University of Technology, Sweden, is published in journals Scientific advance and Nature Communications, revealing how the closest neighbors determine how well the nanoparticles function in the catalyst.
“The long-term goal of the study is to be able to identify superparticles that contribute to more efficient catalysts in the future. To make better use of today’s resources, we also want more As many particles as possible are actively involved in lead researcher Christoph Langhammer at the Department of Physics at Chalmers University of Technology.
Imagine a large group of neighbors gathering together to clean a common yard. They set out on their work, each contributing to the team’s efforts. The only problem is that not all people are equally active. While some are hard-working and productive, others walk around, chat and drink coffee. If you only look at the end result, it will be difficult to know who is the one who works the most and who simply relaxes. To determine that, you need to monitor each person throughout the day. The same applies to the activity of metal nanoparticles in the catalyst.
Seeking more effective catalysts through neighborly cooperation
Inside the catalyst there are a number of particles that influence the efficiency of the reactions. Some particles in the crowd are effective, while others are inactive. But these particles are often hidden in various “pores”, just like in a sponge, and are therefore difficult to study.
In order to be able to see what was actually happening inside the catalyst pore, researchers from Chalmers University of Technology isolated a handful of copper particles in a transparent glass nanotube. When several particles are gathered together in small gas-filled pipes, it is possible to study which particles do what and when, under real world conditions.
In the tube, the particles come in contact with an inflated mixture of oxygen and carbon monoxide. When these substances react with each other on the surface of copper particles, carbon dioxide is formed. It is the same reaction that occurs when the exhaust gas is purified in a car’s catalytic converter, except there platinum, palladium and rhodium particles are commonly used to decompose toxic carbon monoxide. instead of copper. But these metals are expensive and scarce, so researchers are looking for more resource-efficient alternatives.
“Copper can be an interesting candidate for carbon monoxide oxidation. The challenge is that copper tends to change itself during the reaction and we need to measure the oxidation state that copper has when it is active.” The most powerful in the catalyst. ”David Albinsson, a postdoctoral fellow at the Department of Physics at Chalmers and the first author of two recently published scientific papers, says: I, simulating a hollow inside a real catalyst. Scientific advance and Nature Communications.
Anyone who has ever seen an antique bronze roof or statue will notice the sepia metal will soon turn green after exposure to the air and pollutants. The same goes for the copper particles in the catalyst. Hence, it is important to get them to work together effectively.
“What we have now demonstrated is that the oxidation state of a particle can be dynamically affected by its nearest neighbors during the reaction. So last hope is we have. resources can be saved with neighboring countries’ optimization cooperation in catalysts, “said Christoph Langhammer, professor at the Department of Physics at Chalmers.
The new catalyst turns greenhouse gases into hydrogen gas
David Albinsson et al., Copper catalysis at operando condition – bridging the gap between single nanoparticle exploration and the averaging of the catalyst layer, Nature Communications (Year 2020). DOI: 10.1038 / s41467-020-18623-1
David Albinsson et al. Operando discovered the action dynamics of single nanoparticles inside the hole-model catalyst material, Scientific advance (Year 2020). DOI: 10.1126 / sciadv.aba7678
Provided by Chalmers University of Technology
Quote: Researchers probing how nanoparticles affect neighbors in catalysis (2020, Nov. 3) retrieved November 4, 2020 from https://phys.org/news/2020-11 -probe-nanoparticles-affect-neighbors-catallysis.html
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